Propeller



J. L. MUSANTE.

PROPELLER.

APPLICATION FILED nsmz ms.

1,333,126. Patentd-Mar. 9, 1920.

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PROPELLER.

1 5333 125$ Specification of Letters Patent. Patented Dial. 9, 1920.

Application filed December 22, 1915. 1 Serial No. 68,139.

To all-whom may 0092.73 p v bile it hnown that I, JOHN L. MUsAN'rn, ai'ltlZCll of the United States, residing at Frederick. in the county ofFrederick and State of Mary and have invented certain new and usefulImprovements in Propellers,

of which the following is a specification.

li ly invention relates to propellers for aeronautical purposes, inaeroplanes and air fps, and for such other uses, as on boats or tans,for which the same are suitable.

in object of the invention is tov provide a greater area .of propellingsurface to act upon the fluid in which propulsion taking place, withoutunduly increasing the number of propeller blades; also to prevent aportion of the fluid acted upon from escapradially and to compel. thesame toescapc rearwardly in a direction opposite to the direction ofpropulsion. Further objects of the invention are to obtain and uti- .1.e all of the advantages which are or may propeller propeller. 2 is arear elevation of the same.

is a diametrical sectional view on ll-Il of Fig. 2.

i is a cross-section on a larger scale of oneof the blades, on lineIII-III of Fig. 3'.

Referring to the drawings, 1 is the hub of the propeller having suitablemeans whereby it is attached to the driving shaft (not shown) such as abearing Z in which the end of said shaft may be fixed.

The blades of the propeller are indicated at 3. In the constructionillustrated these blades are shown as two in number arranged opposite toeach other, such niunber being preferred; but it will be ui'iderstoodtha, the invention is not confined to any particular number of blades.These blades are fixed to or integral with the hub.

.gure 1 is an edge View or elevation of blade members.

it convenient e'ieans for attaching the blades is to cast with orfixedly attach to a n'ietal hub a number of flanges l, correspondingwiththe number of blades, and to attach the blade members 5,6 to saidflanges by screws, bolts or rivets 7. Whatever method of attachment isadopted it must be very firm, strong and durable.

Each propeller blade comprises two of said members, 5 and 6, eachconsisting of a plate of metal or wood of a strength sulliclent toresist the strain imposed by that speed of revolution for which thepropeller is designed. These plates are spaced apart from each other,and the width of the intervening space 8 increases from the front to therear edge of the blade (Fig. l) The direction of revolution is indicatedby the arrows (Figs. 2 and 4:), andthe narrower entrance partof the slotis at the front edge of the blade and the wider discharge part of theslot is at the rear edge of the blade. Each blade is therefore providedwith two surfaces to act on the fluid me dium, the outer face of themember 6 and the inner face of the member 5, and the discharge of thefluid which has been acted on by the inner surface of the blade member 5is promoted through the rearfopening of the space 8 by the flaring shapeof the'latter.

The inner ends of the blade members are or may be spaced apart by theflanges l; and their outer ends are also spaced apart by suitable means,such as spacers 9 to which the blade members are attached by screws,bolts or rivets 10. The spacers 9 may be formed integral with one of theTheir weight and inertia. is of .value in. maintaining continuity ofrevolution and in aiding the engine in this respect.

The blades have been illustrated as substantially fiat, but may be made,of the known'spiral contour. Also the pitch of the propeller may bedifferent from that shown, and varled according to requirements.

The space 8 may be niade wider at theends of the blades than at the hub.This may be accomplished'b'y shaping the front or rear blade member. tocurve or incline tion, but I do not limit myself thereto or to less thanall the possible forms in which the invention, as hereinafter claimed,may be embodied and distinguished from prior devices. I

The propeller as a whole is very light in weight and strong inproportion to the service which it is capable of rendering, the blademembers serving to brace each other as well as to act on the air orother fluid as described.

The spacers 9 prevent some of the fluid acted on by the propeller, thatwhich is in the spaces 8, from escaping radially and compel it to passrearwardly thus promoting the rarification of theair or partial vacuumin front of the propeller and increasing its power. The hold (so tospeak) which the propeller obtains upon the air by means of the interiorspaces '8 of the propeller blades increases itsstability in air, and thestability of an attached aeroplane.

It will be understood that each propeller blade may have more than twosubstantially parallel members 5, 6, in which case it will have two ormore parallel spaces 8.

What ,is claimed is: 1. A propeller the blades of which are providedwith an air passage extending through the blades in an inclineddirection and being wider toward its rear part and substantiallyparallel with the outer surfacesof the blades. 7

A propeller the blades of which are composed of two members arrangedonein front of the other, inclined relative to each other and attachedtogether, one member having an exterior propelling surface and the othermember having an interior propelling surface, said propeller comprisinga flanged hub to which the inner ends of said members are riveted, andmeans for spacing the outer ends of said. members.

'3. A propeller comprising a hub having spacing lugs, blade membersseparate from said lugs and attached thereto at opposite sides of thesame so as to leave a forwardly tapering air space between said members,

andseparate spacing members between the outer ends of each pair oi blademembers and attached thereto.

a. A pneumatic propeller comp iising a plurality of blades, each of saidblades be ing composed of two members spaced apart hereto.

' JOHN .L. MUSANTE

